421–422, 424 ◑ Single-source

Pontiac · Regular Production Option

Mirrors

Years 1968 Models 1

Documented applications

Firebird / Trans Am →

• 1968 ◑ Single-source

This page aggregates every documented appearance of 421–422, 424 in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.